More about the jet stream

The following figure is modified from Bely (2003): "The design and construction of large optical telescopes". I added Tenerife and my location (Crete), with the approximate values for the annual jet stream intensities. In fact none of the locations appear to be in particularly good locations with regard to the jet stream; the weakest jet stream is found either near the equator or near the poles. The well-traveled astrophotographer and biologist Jean Dragesco speaks highly of the seeing in equatorial Africa in his book "High resolution astrophotography", and laments the fact that there are no observatories there. My latitude seems particularly bad, but as we saw in the previous post, perhaps the jet stream isn't the big seeing killer after all. 

"Sixteen-year statistics for the wind velocity at an altitude corresponding 
to a 200-millibar atmospheric pressure as a function of latitude in December 
and June. The vertical bars represent the variation in longitude, the solid 
line is for longitude 0, and the dashed line for longitude 180◦" (from Bely 2003).